feat: explorer API, wallet, CCIP scripts, and config refresh

- Backend REST/gateway/track routes, analytics, Blockscout proxy paths.
- Frontend wallet and liquidity surfaces; MetaMask token list alignment.
- Deployment docs, verification scripts, address inventory updates.

Check: go build ./... under backend/ (pass).
Made-with: Cursor

backend/api/rest/.env.example

@@ -0,0 +1,16 @@
+# Core explorer API
+PORT=8080
+CHAIN_ID=138
+RPC_URL=https://rpc-http-pub.d-bis.org
+DB_HOST=localhost
+DB_NAME=explorer
+
+# Mission-control helpers
+TOKEN_AGGREGATION_BASE_URL=http://127.0.0.1:3000
+BLOCKSCOUT_INTERNAL_URL=http://127.0.0.1:4000
+EXPLORER_PUBLIC_BASE=https://explorer.d-bis.org
+
+# Track 4 operator script execution
+OPERATOR_SCRIPTS_ROOT=/opt/explorer/scripts
+OPERATOR_SCRIPT_ALLOWLIST=check-health.sh,check-bridges.sh
+OPERATOR_SCRIPT_TIMEOUT_SEC=120